Solve the beam.
Show the working.
Outerfibre is a structural workspace for beams and 2D frames. Model on a drawing board, solve by a named method, and print a calc package another engineer can actually check.
A calculator that draws like you do.
Not a form with a diagram bolted on. You place supports and loads on the beam itself — the model is the input, and your assumptions stay visible.
- —Any support arrangement. Pins, rollers, fixed ends and internal hinges — including propped cantilevers and multi-span beams.
- —Real load cases. Point loads, distributed loads, applied moments — grouped into named cases you can switch without rebuilding the model.
- —The method is named. The solver picks the simplest eligible method — equilibrium, segmented equilibrium or matrix stiffness — and says which one it used.
- —Diagrams to scale. Shear, moment and axial diagrams drawn against the model, with signed extremes labelled at the station they occur.
Every number shows its working.
Most software gives you an answer. Outerfibre gives you the derivation: formula, substituted values, result — for every step, on every solve. If a checker can't follow it, it isn't engineering.
R_A = (P·b + w·c·(c/2)) / L
R_A = (12.0×4.0 + 4.0×3.0×1.5) / 6.0
R_A = 11.00 kN ↑M(x) = R_A·x − P·⟨x−a⟩ − w·⟨x−d⟩²/2
M(2.000) = 11.00 × 2.000
M_max = 22.00 kN·m at x = 2.000 mΣFy = 11.00 + 13.00 − 12.0 − 4.0×3.0 = 0.000 kN
Equilibrium satisfied · residual < 1×10⁻⁹- —Derivations, not data dumps.Reactions, extremes and checks each appear as formula → substitution → result, in the order you'd write them by hand.
- —Equilibrium verified on every solve. ΣF and ΣM residuals are computed and printed — the check is part of the output, not a claim.
- —A package you can issue. Print or save the whole working as a titled, numbered calc package — ready for the project file and the person who signs it.
Frames, under the same rules.
The 2D frame workspace handles columns, rafters and portals with the same discipline: model it visibly, solve it by a named method, print the working.
- —Portal frames and plane frames. Members at any angle, pinned or fixed bases, loads on any member.
- —Member-by-member results. Reactions, end forces and axial, shear and moment diagrams for every member — not just a coloured picture.
- —The same calc package. Frame results print with the same working and the same title block as the beam sheets.
Next: three dimensions.
3D modelling and finite-element analysis are in development. They ship when they meet the same bar as everything above — the working shown, nothing hidden. The 2D tools stay fast in the meantime.
Free while we build.
$0
No card, no trial clock, no locked exports. Paid plans will arrive with team features and 3D — and early users will keep a generous free tier. Until then the deal is simple: use it, break it, tell us.
Open the app FREE